Bridge Type
Main Span(s): Steel continuous [4] Truss - Thru [10]
Approach Span(s): Concrete [1] Tee beam [04]
Deck: Concrete Cast-in-Place [1] with Wearing Surface:
Bridge Dimensions
Length: 315.5 m = 1035.2 ft
Main Spans: 3 at 110 m = 360.9 ft
Approach Spans: 2
Skew: 0
Width, Roadway: 8.5 m = 27.9 ft (2 Lanes) and Out-To-Out: 9.5 m = 31.2 ft for a 8.5 m = 27.9 ft approaching roadway.
Vertical Clearance: 4.85 m = 15.9 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Winston County [133], Alabama [01]
Owned by State Highway Agency [01], DOT District: 10
DUNCAN BRIDGE
Condition
Deck: Fair [5]
Superstructure: Poor [4]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 48.6 metric ton = 53.5 tons (Load Factor(LF) [1])
Inventory: 29.2 metric ton = 32.1 tons (Load Factor(LF) [1])
Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Equal to present minimum criteria [6]
Waterway: Better than present minimum criteria [7] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: March 1999 [399] and Frequency: 24
Future Work
Work Needed: Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Bridge Detour: 6 km = 3.7 mi
Traffic
ADT: 4590 (2009) and Trucks: 20%
Future ADT: 6000 (In 2040
)
